Mix together all ingredients except butter and syrup in a medium bowl. Melt 2 teaspoons butter in a large nonstick frying pan over medium heat. Spoon batter by 1/3 cup portions into pan, making 3 or 4 pancakes at a time. Cook, turning once, until cooked through, 8 to 10 minutes. Continue making pancakes with remaining batter, adding more butter to pan for each batch. Serve with syrup and more butter, if you like.